|Publication number||US8126502 B2|
|Application number||US 11/967,306|
|Publication date||Feb 28, 2012|
|Filing date||Dec 31, 2007|
|Priority date||Dec 31, 2007|
|Also published as||US8385970, US20090168738, US20120115420|
|Publication number||11967306, 967306, US 8126502 B2, US 8126502B2, US-B2-8126502, US8126502 B2, US8126502B2|
|Original Assignee||Intel Corporation|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (4), Referenced by (16), Classifications (9), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
In a high-throughput wireless local area network (HT WLAN), such as defined by the Institute of Electrical and Electronics Engineers (IEEE) 802.11n specification, devices may operate in the 2.4 GHz band using 40 MHz wide channels or 20 MHz wide channels, thereby allowing a 40 MHz capable basic services set (BSS) to switch between operation in a 20 MHz wide channel or in a 40 MHz wide channel. Under such an arrangement, some devices may be interfered with by others' 40 MHz operation, for example, devices that are operating in accordance with a BLUETOOTH standard will be interfered with by the 802.11n devices operating in a 40 MHz wide channel. The interference will be result of operating BLUETOOTH in the vicinity of the IEEE 802.11n devices that belong to a different BSS that overlaps in this area, overlapping basic services set (OBSS). To accommodate BLUETOOTH devices, devices operating in 40 MHz wide channels should switch to operation in 20 MHz wide channels to allow better BLUETOOTH coexistence with 802.11n devices. In order to implement a dual channel width system, however, stations that are capable of operating in both 40 MHz channels and 20 MHz channels are required to scan the set of 20 MHz channels to listen for stations that indicates operating BLUETOOTH and then switch if one or more such devices are found. Thus, stations that are not access points potentially may be required to scan up to all of the channels on which the station is capable of operating, even if such stations are in a power-saving mode. Furthermore, an access point may be required to quiet its BSS for a relatively longer period of time while scanning both 40 MHz and 20 MHz channels.
Claimed subject matter is particularly pointed out and distinctly claimed in the concluding portion of the specification. Such subject matter may, however, be understood by reference to the following detailed description when read with the accompanying drawings in which:
It will be appreciated that for simplicity and/or clarity of illustration, elements illustrated in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity. Further, if considered appropriate, reference numerals have been repeated among the figures to indicate corresponding and/or analogous elements.
In the following detailed description, numerous specific details are set forth to provide a thorough understanding of claimed subject matter. It will, however, be understood by those skilled in the art that claimed subject matter may be practiced without these specific details. In other instances, well-known methods, procedures, components and/or circuits have not been described in detail.
In the following description and/or claims, the terms coupled and/or connected, along with their derivatives, may be used. In particular embodiments, connected may be used to indicate that two or more elements are in direct physical and/or electrical contact with each other. Coupled may mean that two or more elements are in direct physical and/or electrical contact. Coupled may, however, also mean that two or more elements may not be in direct contact with each other, but yet may still cooperate and/or interact with each other. For example, “coupled” may mean that two or more elements do not contact each other but are indirectly joined together via another element or intermediate elements. Finally, the terms “on,” “overlying,” and “over” may be used in the following description and claims. “On,” “overlying,” and “over” may be used to indicate that two or more elements are in direct physical contact with each other. “Over” may, however, also mean that two or more elements are not in direct contact with each other. For example, “over” may mean that one element is above another element but not contact each other and may have another element or elements in between the two elements. Furthermore, the term “and/or” may mean “and”, it may mean “or”, it may mean “exclusive-or”, it may mean “one”, it may mean “some, but not all”, it may mean “neither”, and/or it may mean “both”, although the scope of claimed subject matter is not limited in this respect. In the following description and/or claims, the terms “comprise” and “include,” along with their derivatives, may be used and are intended as synonyms for each other.
Referring now to
In one or more embodiments, station 112 may desire to communicate with device 116 using BLUETOOTH 122. In order to allow station 112 and device 116 to communicate with each other using BLUETOOTH and to mitigate or avoid interference by nearby devices operating using an IEEE 802.11 BSS, stations operating at the first bandwidth 118 of 40 MHz could switch over to operation at the second bandwidth 120 of 20 MHz. In order, however, for a given station, such as station 114, to know when another station is operating using BLUETOOTH 122 would require that device and/or up to all other devices on network 100 to scan all channels at the first bandwidth 118 and the second bandwidth 120 to determine if another device, such as device 116, is operating at using BLUETOOTH 122. Furthermore, while access point 110 is performing such scanning, access point 110 may not be able to broadcast to other devices. In one or more embodiments, a device that desires to communicate using BLUETOOTH 122 may broadcast to other devices on network 100 that the device using BLUETOOTH 122 is not tolerant of operation at the first bandwidth 118 since operation at the first bandwidth 118 of 40 MHz in IEEE 802.11 may interfere with such BLUETOOTH 122 operation. Such a notification of intolerance at the first bandwidth 118 may be broadcast via a Probe Request frame in any of the channels that the device using BLUETOOTH 122 views as sensitive to operation at the first channel width 118. Thus in one or more embodiments, when station 112 wants to communicate with device 116 using BLUETOOTH 122, station 112 will broadcast its intolerance to operation at first bandwidth 118 of 40 MHz to all, or nearly all, of the other IEEE 802.11 devices on network 100 that station 112 is now intolerant to communications at first bandwidth 118. This method may be implemented in one or more embodiments in lieu of having station 112 merely broadcast its 40 MHz intolerance to access point 110 only and requiring the other stations in network 100 to listen for that communication between station 112 and access point 110. Upon receiving the notification from a device that the device is intolerant to operation at the first bandwidth 118, the other IEEE 802.11 devices on network 100 may switch to operation at second bandwidth 120. These devices on network 100 may continue to operate at second bandwidth 120 while the devices are continuing to receive notification of intolerance to operation at first bandwidth 118 from station 112. If the devices on network 100 do not receive any further notification of intolerance to operation at first bandwidth 118 for a predefined period of time, the devices may switch their operation back to bandwidth 110.
In one or more embodiments, network 100 may operate in an infrastructure mode of operation using access point 110 to manage communication between one or more other devices, such as station 112, station 114, and/or device 116. Alternatively, network 100 may operate in an Independent Basic Service Set (IBSS) mode, or ad-hoc mode, in which no device on network 100 is functioning as an access point. Furthermore, in one or more embodiments, access point 110, station 112, and/or station 114 may be operating in compliance with an IEEE 802.11n standard using first bandwidth 118 and second channel width 120 in which first channel bandwidth 118 may comprise 40 MHz and second channel width 120 may comprise 20 MHz in the 2.4 GHz spectrum. Likewise, station 112 may be operating in compliance with a BLUETOOTH standard using BLUETOOTH communication 122. In the event station 112 intends to communicate with device 116 via BLUETOOTH communication 122, station 112 may broadcast a signal indicating that station 112 is intolerant to operation at first bandwidth 118. In response, other IEEE 802.11 devices on network 100 may switch operation from first bandwidth 118 of 40 MHz to second bandwidth 120 of 20 MHz, and thereby force other devices, such as access point 110 and/or station 114, to communicate using second bandwidth 120. It should be noted, however, that these are merely example for operation of network 100 in compliance with IEEE 802.11n and/or BLUETOOTH standards, and network 100 may likewise be operated in compliance with various other standards and/or special interest groups (SIGs), including by not limited to Worldwide Interoperability for Microwave Access (WiMAX) promulgated by the WiMAX Forum, the Third Generation Partnership Project, Long Term Evolution (3GPP-LTE), or the like, and the scope of the claimed subject matter is not limited in this respect. Further details of the operation of network 100 in the event of multiple overlapping BSS (OBSS) is discussed with respect to
Referring now to
In the event the predefined time has expired, a determination may be made at block 216 whether all channels at second channel width 120 have been visited by station 112 wanting to use or using BLUETOOTH 122. It is at this branch of method 200 that station 112 informs the other devices operating at first channel width 118 to cease operating at first channel width 120 and start operating at second channel width 120. To accomplish this, station 112 communicates with devices in the channels at first bandwidth 118 and/or second bandwidth 120 so the devices operating at first channel width 118 may be informed of the switch to second channel width 120. It is during execution of block 218 that station 112 informs other IEEE 802.11 devices to kill operation at first bandwidth 118 and switch to operation at second bandwidth 120. In the event that all channels have been visited and all devices operating at first bandwidth 118 and/or second bandwidth 120 have been informed to switch to second bandwidth 120, then operation of method 200 may continue at block 214 in which operation at second bandwidth 120 may occur. If however all channels have not yet been visited, at block 218 access point 110 may switch to a next channel at the first bandwidth 118 or the second bandwidth 120 to notify any device operating in at first bandwidth 118 to cease operation at first bandwidth 118 and switch to operation at second bandwidth 120. At block 220, station 112 may issue probe requests asserting its intolerance to operation at first bandwidth 118 of 40 MHz, so that the devices receiving the probe request will know to switch their operation to second bandwidth 120. Operation of method 200 may continue until all channels at first bandwidth 118 have been visited and informed of the switch to second bandwidth 120, at which time operation of method 200 may continue at block 214 with the operation of devices on network 100 at second channel width 120. After receiving such a probe request, any access point 110 may switch its BSS to operation at second bandwidth 120 of 20 MHz. Access point 110 may then choose to go back to operation at first bandwidth 118 after the predefined time if during such an interval access point is no longer receiving probe requests with an assertion of intolerance to operation at first bandwidth 118 of 40 MHz.
Referring now to
Station 112 may communicate with access point 110 via wireless communication link 332, in which access point 110 may include at least one antenna 320, transceiver 324, processor 326, and memory 328. In one embodiment, access point 110 may be a base station of a cellular telephone network, and in an alternative embodiment, access point 110 may be an access point or wireless router of a wireless local or personal area network, although the scope of the claimed subject matter is not limited in this respect. In an alternative embodiment, access point 110 and optionally station 112 may include two or more antennas, for example, to provide a spatial division multiple access (SDMA) system or a multiple input, multiple output (MIMO) system, although the scope of the claimed subject matter is not limited in this respect. Access point 110 may couple with network 330 so that station 112 may communicate with network 330, including devices coupled to network 330, by communicating with access point 110 via wireless communication link 332. Network 330 may include a public network, such as a telephone network or the Internet, or alternatively network 330 may include a private network, such as an intranet, or a combination of a public and a private network, although the scope of the claimed subject matter is not limited in this respect. Communication between station 112 and access point 110 may be implemented via a wireless local area network (WLAN), for example, a network compliant with a an Institute of Electrical and Electronics Engineers (IEEE) standard, such as IEEE 802.11a, IEEE 802.11b, IEEE 802.11n, HiperLAN-II, and so on, although the scope of the claimed subject matter is not limited in this respect. In another embodiment, communication between station 112 and access point 110 may be at least partially implemented via a cellular communication network compliant with a Third Generation Partnership Project (3GPP or 3G) standard, although the scope of the claimed subject matter is not limited in this respect. In one or more embodiments, antenna 318 may be utilized in a wireless sensor network or a mesh network, although the scope of the claimed subject matter is not limited in this respect.
Referring now to
Information handling system 400 may comprise one or more processors, such as processor 410 and/or processor 412, which may comprise one or more processing cores. One or more of processor 410 and/or processor 412 may couple to one or more memories 416 and/or 418 via Memory Bridge 414, which may be disposed external to processors 410 and/or 412, or alternatively at least partially disposed within one or more of processors 410 and/or 412. Memory 416 and/or memory 418 may comprise various types of semiconductor based memory, for example, volatile type memory and/or non-volatile type memory. Memory bridge 414 may couple to a graphics system 420 to drive a display device (not shown) coupled to information handling system 400.
Information handling system 500 may further comprise input/output (I/O) bridge 422 to couple to various types of I/O systems. I/O system 424 may comprise, for example, a universal serial bus (USB) type system, an IEEE 1394 type system, or the like, to couple one or more peripheral devices to information handling system 400. Bus system 426 may comprise one or more bus systems such as a peripheral component interconnect (PCI) express type bus or the like, to connect one or more peripheral devices to information handling system 400. A hard disk drive (HDD) controller system 428 may couple one or more hard disk drives or the like to information handling system, for example Serial ATA type drives or the like, or alternatively a semiconductor based drive comprising flash memory, phase change, and/or chalcogenide type memory or the like. Switch 430 may be utilized to couple one or more switched devices to I/O bridge 422, for example, Gigabit Ethernet type devices or the like. Furthermore, as shown in
Although the claimed subject matter has been described with a certain degree of particularity, it should be recognized that elements thereof may be altered by persons skilled in the art without departing from the spirit and/or scope of claimed subject matter. It is believed that the subject matter pertaining to channel width switching in multiple OBSS systems and/or many of its attendant utilities will be understood by the forgoing description, and it will be apparent that various changes may be made in the form, construction and/or arrangement of the components thereof without departing from the scope and/or spirit of the claimed subject matter or without sacrificing all of its material advantages, the form herein before described being merely an explanatory embodiment thereof, and/or further without providing substantial change thereto. It is the intention of the claims to encompass and/or include such changes.
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|U.S. Classification||455/552.1, 370/338, 375/346, 455/515, 455/41.2, 370/342|
|Apr 28, 2009||AS||Assignment|
Owner name: INTEL CORPORATION, CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TRAININ, SOLOMON;REEL/FRAME:022604/0611
Effective date: 20071229
|Jul 3, 2012||CC||Certificate of correction|
|Aug 12, 2015||FPAY||Fee payment|
Year of fee payment: 4